Description
The Bently Nevada 3500/42M is a high-performance, four-channel machinery protection monitor designed to interface with proximity transducers and seismic sensors. It is a core component of the 3500 Series Machinery Protection System, providing continuous online monitoring for critical rotating assets.
Product Introduction
The 3500/42M Proximitor Monitor is engineered to accept signals from various types of transducers, including Proximitor sensors, velocity sensors, and accelerometers. It processes these signals to provide measurements such as radial vibration, thrust position, eccentricity, and differential expansion. The Bently Nevada Seismic Monitor provides advanced alerting and machine protection by comparing processed values against user-defined alarm setpoints, making it indispensable for turbine and compressor safety.
BENTLY 3500/42M
Technical Specifications (Datasheet)
The following parameters outline the functional and electrical capabilities of the 3500/42M:
| Parameter | Specification |
| Number of Channels | 4 Channels (Independently Programmable) |
| Input Signal Types | Proximitor, Accelerometer, Velocity (Seismic) |
| A/D Conversion | 24-bit resolution |
| Accuracy | Within \pm 0.33% of full-scale typical |
| Frequency Response | 0.5 Hz to 30 kHz (depending on configuration) |
| Alarms | Alert and Danger levels for each channel |
| Buffered Outputs | 4 Front-panel coaxial connectors (BNC) |
| Power Consumption | 7.7 Watts (Typical) |
| Operating Temperature | -30°C to +65°C (-22°F to +150°F) |
| Country of Origin | USA |
Product Usage & Installation
- Rack Placement: The 3500/42M is a full-height module that must be installed in any available slot of the 3500 System Rack, excluding the power supply and RIM slots.
- Configuration: Use the 3500 Rack Configuration Software to define the sensor type, orientation, and alarm setpoints. The module supports “Pairing” of channels for XY vibration measurements.
- I/O Module: The monitor must be paired with a compatible I/O module (e.g., Internal or External Termination) installed at the rear of the rack to connect field wiring.
- Signal Testing: Utilize the front-panel buffered BNC outputs to connect portable diagnostic equipment (like the 3500/22M or data collectors) for real-time waveform analysis without interrupting the protection loop.
Key Application Benefits
- Machine Protection: Provides automatic shutdown capability via relay modules when vibration or position levels exceed safe limits.
- High Reliability: Features comprehensive self-diagnostics to detect sensor faults or internal hardware failures (NOT OK status).
- Versatility: Capable of performing multiple measurement types (Vibration, Trust, REBAM) within a single hardware platform.
Recommended Similar Models
For specialized monitoring or different sensor requirements within the 3500 system, consider the following:
- 3500/40M: A four-channel Proximitor monitor specifically optimized for radial vibration and thrust.
- 3500/45: A four-channel Position Monitor for differential expansion and case expansion.
- 3500/44M: An Aeroderivative Gas Turbine Monitor for high-frequency seismic measurements.
- 3500/50M: A Tachometer Module for speed and zero-speed monitoring.
- 3500/60: A six-channel Temperature Monitor for bearing and winding temperature protection.
